Question

A laser produces light with a wavelength of 490 nm in vacuum. It takes 2.85 ns...

A laser produces light with a wavelength of 490 nm in vacuum. It takes 2.85 ns for the light to pass through 45 cm of an unknown transparent material.

a. What is the index of refraction of the material?

b. What is the wavelength of the light in the substance?

c. How long would it take for this light to pass through 45 cm of water?

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Answer #1

a) Speed of light in the medium is

Now, index of refraction of the medium is given by

b) Wavelength of light in the substance is

c) Time for the light to pass through 45 cm of water:

refractive index of water is 4/3, therefore speed of light in water is

Now, time taken will be given as

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